| 华北地区深、浅部应力状态的差异及其成因研究 |
| |
| 引用本文： | 梁海华,刘树文,侯建军,常祖峰.华北地区深、浅部应力状态的差异及其成因研究[J].中国地震,2000,16(1):69-76. |
| |
| 作者姓名： | 梁海华 刘树文 侯建军 常祖峰 |
| |
| 作者单位： | 中国北京,100871,北京大学地质学系 |
| |
| 摘 要： | 在分析一评价各种应力资料的基础上，从三维空间分析应力图象的差异性，并从边界条件和岩石圈介质的不均一性出发，提出华北地块构造应力双层模式。多面手用有限元方法进进了模拟，计算结果与实际资料相当吻合，即以１０ｋｍ左右深度的滑脱面为分界，其下存在一个比较一致的以近水平的北东－北东东的最大压应力为特征的挤压应力场，而滑脱成之上的浅 地块内主应力方向的一致性很差，总体上反映出多方向伸展的格局。计算得到的剪应力
|
| 关 键 词： | 华北地区 应力状态 滑脱面 华北地块 构造成困 |
Differential Tectonic Stress Pattern Between the Deep and Shallow Crust in North China and Its Possible Genesis |
| |
| Liang Haihua,Liu Shuwen,Hou Jianjun,Chang Zufeng.Differential Tectonic Stress Pattern Between the Deep and Shallow Crust in North China and Its Possible Genesis[J].Earthquake Research in China,2000,16(1):69-76. |
| |
| Authors: | Liang Haihua Liu Shuwen Hou Jianjun Chang Zufeng |
| |
| Abstract: | This paper approaches to the subject of the neotectonic stress field from the data of focal mechanism solution, ground stress measurement, tectonic mechanical analysis and geodetic surveying, and finds out that the orientations of the maximum principal compressive stress patterns are quite discordant with different methods and the stress patterns are widely different from the shallow part to the depth of the crust in North China.Based on the analysis of above\|mentioned data, we established a duplex model by considering the diversities of the stress patterns in 3\|dimentional space, the boundary conditions and the lithospheric media, and make an inverse calculation by finite element method. The calculated resuts fitted well with the reality in North China,i.e.the stress patterns in lower crust which is below the detachment interface at the depth of 10km from ground surface are relatively consistent with nearly horizontal state and NE\|ENE trending of the maximum principal compressive stress axes, whereas the stress patterns in upper crust which is above the detachment interface are widely divergent with extensional state in polydirections. Therefore, small earthquakes are prone to occur in the shallow part while large earthquakes are generated in the lower crust. The hypocentral location for a potential large erathquake may be inferred from the shearing stress distribution calculated by finite element method based on the duplex model. |
| |
| Keywords: | Duplex model of tectonic stress\ Detachment interface\ North China block |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
